William III "le bon," Count of Hainault

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William III "le bon," Count of Hainault, son of Jean II d'Avesnes, Count of Hainault, Holland, and Zeeland and Philippe of Luxembourg, was born say 1286.1,2 He died at Valenciennes, France, 7 June 1337.1,2

William married Jeanne of Valois, daughter of Charles of France, Chev., Count of Valois and Marguerite of Sicily, at Chauny, France, 23 May 1305.1,2

By one or more unknown mistresses, he had several illegitimate children.1

Family 1

  • Jan van der Poel1
  • Jan Aelman1
  • Claas van der Gheijne1
  • Jan van Dolre1
  • Willem of Holand1
  • Jan Zuurmond1
  • Elizabeth of Holand1 d. Sep 1375

Family 2

Jeanne of Valois b. abt. 1294, d. 7 Mar 1352
  • Jean of Hainault1
  • Guillaume IV of Hainault Count of Hainault and Holland1
  • Louis of Hainault1
  • Marguerite of Hainault1
  • Agnes of Hainault1
  • Isabelle of Hainault1
  • Sibylla of Hainault a13051
  • Philippa Hainault+1,3 b. abt. 1314, d. 15 Aug 1369
  • Jeanne of Hainault1 b. abt. 1315
This person was last edited on18 Jun 2021


  1. [S1947] Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families (Five vols., Salt Lake City, Utah: s.p., 2013), 3:189 (Hainault 9), further cited as Richardson, Royal Ancestry.
  2. [S1972] Neil D. Thompson and Charles M. Hansen, The Ancestry of Charles II, King of England: A Medieval Heritage [Twelve Generations] (Saline, Michigan: McNaughton & Gunn, 2012), #2130, further cited as Thompson and Hansen, The Ancestry of Charles II.
  3. [S1972] Thompson and Hansen, The Ancestry of Charles II, #1065.